Not sure what you mean by RIP and "it was fun while it lasted" considering all it did gameplay wise was make your Cobra shot a slightly faster cast. The thing that made Haste > Crit for BM was Blink Strikes. Prior to 5.2 the difference in the weight of our secondary stats was so small that the change to Blink Strikes scaled with Haste better than Crit and Mastery which was enough to push Haste to the top.

Haste will still be the top stat for BM in 5.4 considering we get another RPPM proc in the legendary cloak.

Not sure what you mean by RIP and "it was fun while it lasted" considering all it did gameplay wise was make your Cobra shot a slightly faster cast. The thing that made Haste > Crit for BM was Blink Strikes. Prior to 5.2 the difference in the weight of our secondary stats was so small that the change to Blink Strikes scaled with Haste better than Crit and Mastery which was enough to push Haste to the top.

Haste will still be the top stat for BM in 5.4 considering we get another RPPM proc in the legendary cloak.

The only RPPM agi trinket is the reverse renatakki one (I believe the 2 with damage proccs are bad enough to not take them into account), with which sometimes you could blow all the 20 stacks in less than 10 sec, making it a bit bleh. the bad thing is that when 5.4 hits, our 5.3 BiS trinkets will suffer a big nerf, and instead of keeping them until HCS, we will want to change them asap. I believe that our current tier bonuses will not be affected by the change, other than the initial change of puting the bad luck protection to 90s by default, so proccs in the start are no longer guaranteed. The tier bonuses didnt double dip with haste acording to their idea of double dipping, as they are flat damage proccs that will deal the same damage whatever is your haste. The meta gem shouldn't be affected, as it is also a flat damage proc in the end. I believe this tier we will go back to traditional ICD trinkets, and that the CD reduction one and the agi one with mastery procc will be our BiS, we will need to see how the change to RPPM works.

This will be a noticable nerf to hunters, but this should be an even larger nerf to classes that scaled well with haste (e.g. warlocks). Overall, I think this will be a positive outcome that will make it more feasible for Blizzard to strike dps balances between the classes.

The only RPPM agi trinket is the reverse renatakki one (I believe the 2 with damage proccs are bad enough to not take them into account), with which sometimes you could blow all the 20 stacks in less than 10 sec

Sorry for ignoring half your post and not contributing to the topic much, but I have two things I want to talk about.

The reverse Renataki trinket has been reworked some time ago, it now gives you 20 stacks upon activation and you lose 1 stack per second. So it will always run it's full duration and it's literally a reverse Renataki apart from instead of gaining/losing a stack every 2 seconds, it's every 1 second.

Second thing is, the Multi-Strike trinket for Survival at least actually doesn't seem that bad now. It's been slightly reworked as well to include an agility proc much like the cooldown reduction trinket, but the proc itself was doing a ton of damage for me and our two other Hunters on the PTR bosses we tried it on. The proc chance of Multi-Strike has been slightly reduced since then though. I've always said that the trinket was going to be utter garbage for us because our pet doesn't benefit from it. However, I'm starting to change my opinion.

For what it's worth, the cleave trinket now has an agility proc as well.

Haromm's Talisman is almost 5% DMG increase only via Multistrike which would be huge if it worked on all of our damage (pets / guardians). Even if not, Ebon Detonator give us 3.27% additional damage on pets. ATM, damage between us and the pets is roughly 50:50. So, if this will remain the same (50:50), HT will passively boost us by 2.3% while TEB by 1.64%.

However, the hardest nuking abilities come from pet(s). On the other hand, TEB will be much much harder to gamble then Rentaki.

the last time I tried the new trinkets was 1 or 2 builds ago, and the multistrike procc was accounting for less than 1% of my total damage on the dummy, close to 2k out of 200k. If they buffed or either fixed it gives us at least the chance to have multiple viable options, not like ToT were the difference between the BiS pair of trinkets and the others was abysmal. The procc needs to be at least 3% of the total damage to compete with the other options. I also hope it doesn't turn into the new Vial of Shadows, making it way better than the others.